scale of productivity and preference. So also in later time, with the rise of "industry" and the growth of the technology of communication, urban property has gained, as contrasted with rural property, and land placed in an advantageous position relatively to shipping and railroads has acquired a value and a "productiveness" which could not be claimed for it apart from these modern technological expedients. The argument of the single-tax advocates and other economists as to the "unearned increment" is sufficiently familiar, but its ulterior implications have not commonly been recognised. The unearned increment, it is held, is produced by the growth of the community in numbers and in the industrial arts. The contention seems to be sound, and is commonly accepted; but it has commonly been overlooked that the argument involves the ulterior conclusion that all land values and land productivity, including the "original and indestructible powers of the soil," are a function of the "state of the industrial art." It is only within the given technological situation, the current scheme of ways and means, that any parcel of land has such productive powers as it has. It is, in other words, useful only because, and in so far, and in such manner, as men have learned to make use of it. This is what brings it into the category of "land," economically speaking. And the preferential position of the landlord as a claimant of the "net product" consists in his legal right to decide whether, how far, and on what terms men shall put this technological scheme into effect in those features of it which involve the use of his parcel of land. * * * * *